GNU bug report logs - #26073
How should cl-symbol-macrolet interact with rebindings?

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Package: emacs;

Reported by: Paul Pogonyshev <pogonyshev <at> gmail.com>

Date: Sun, 12 Mar 2017 13:26:01 UTC

Severity: normal

Tags: fixed

Fixed in version 27.1

Done: Noam Postavsky <npostavs <at> gmail.com>

Bug is archived. No further changes may be made.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Paul Pogonyshev <pogonyshev <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: bug in generator function with nested dash anaphoric macros
Date: Sun, 12 Mar 2017 14:25:06 +0100

To reproduce:

(iter-do (y (funcall (iter-lambda (x)
                       (--each x
                          (let ((y (--map (- it) it)))
                            (iter-yield y))))
                     '((1 2) ( 3 4))))
  (print y))

This should print (-1 -2) and (-3 -4), but instead results in an error.
If you comment out the `iter-yield' form, the example evaluates---
producing different output, of course, but at least without errors.

This looks related to bug #26068, but is not fixed by the patch in
that bug. It is likely related to that both nested dash forms use
`it' variable, and it looks like the wrong (outer) `it' is passed to (- it).

Paul
This bug report was last modified 7 years and 100 days ago.

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